Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
duc van » duc tan, duc manh, duc phan
cua cau » cua cac, cua chu, cua cay
ve cao » va cao, ve bao, ve cac
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach thu)) nang xa hoi. hieu ve cao ((duc van) OR (duc va)) hanh vi cua cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) OR (sach thu)) nang xa hoi. hieu ve cao ((duc van) or (duc va)) hanh vi cua cau~".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) OR (sach thu)) nang xa hoi. hieu ve cao ((duc van) or (duc va)) hanh vi cua cau*.